How would I use JTag to diagnose an ATSAM3x8E processor?

Question

I have never used jtag before, and am still learning about machine language.

I have a 3D printer using a an arm cortex m3 based processor. After sitting for a while it nolonger will even register on my computer via usb ports. I erased the memory on the chip and it still doesn't show up as a com port on my pc like it used to.

I'm beginning to think I fried the chip with static electricity or something. There is a jtag connector on the board. How exactly can I usethe JTag connector to test the chip for damage? There isn't much else on the board other than the chip. Any other chips are drivers for stepper motors and such. And the usb appears to go directly to the cpu, but don't take my word on that.

Answer 1

要通过JTAG（或SWD）测试芯片，您应该使用JTAG调试器，也称为“在线调试器”或“在线仿真器”。您可以获得低于50美元或高于2000美元的价格。

然而，芯片的固件可能阻止JTAG访问，例如除非你擦除闪光灯。但是既然你这样做了，这不应该是一个限制因素。